The play, based on the deadlocked 1960 national convention in Philadelphia, has particular relevance considering the current campaign trail antics, McCormack said.

"It feels like nothing has changed," he said. "That's just enlightening and depressing. It truly is. ...Part of (the play's relevance) is how brilliant a writer Gore Vidal is, and the other is just the coincidence of everything the GOP does every day. Something they say, the Etch-a-Sketch moment last week. I mean, there's a joke in this play of contraception and Catholic Church that two months ago would have been an ancient reference, and now is completely timely, which is bizarre and sad."

For more with McCormack on the Broadway role and its relevance to current culture and politics, watch the video in the player above.